Karen wanting to strengthen her kegel muscles, starts walking around with inserted kegel balls. She realizes she really enjoys light stimulation in public, and one day decides to up the ante to a vibrator or plug. Around this point Matt, who has been feeling rather turned on and awkward about all this, decides he has to tell her that he can sense these things and maybe don't bring sex toys to work.
karen/matt: exhibitionism
Naturally, Karen ignores this.